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WO2019048190A1 - Piston - Google Patents

Piston Download PDF

Info

Publication number
WO2019048190A1
WO2019048190A1 PCT/EP2018/071929 EP2018071929W WO2019048190A1 WO 2019048190 A1 WO2019048190 A1 WO 2019048190A1 EP 2018071929 W EP2018071929 W EP 2018071929W WO 2019048190 A1 WO2019048190 A1 WO 2019048190A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
groove
radius
transition
flank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2018/071929
Other languages
German (de)
English (en)
Inventor
Hannes Rösch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mahle International GmbH
Original Assignee
Mahle International GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mahle International GmbH filed Critical Mahle International GmbH
Publication of WO2019048190A1 publication Critical patent/WO2019048190A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F5/00—Piston rings, e.g. associated with piston crown
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/04—Injectors peculiar thereto
    • F02M69/042—Positioning of injectors with respect to engine, e.g. in the air intake conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/22—Rings for preventing wear of grooves or like seatings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/16—Pistons  having cooling means
    • F02F3/20—Pistons  having cooling means the means being a fluid flowing through or along piston
    • F02F3/22—Pistons  having cooling means the means being a fluid flowing through or along piston the fluid being liquid

Definitions

  • the present invention relates to a piston for an internal combustion engine with a piston head and a piston skirt according to the preamble of
  • Claim 1 The invention also relates to an internal combustion engine equipped with such a piston.
  • Piston ring is provided.
  • the annular grooves usually have two groove flanks extending in the radial direction of the piston and a groove base aligned parallel to a piston axis.
  • these annular grooves are weak points on the known piston, wherein to increase the strength of existing between the annular grooves ring webs, in particular with respect to a notch effect, in principle, two measures come into question: on the one hand, an axially higher and thus more stable annular web can be formed whereby, however, the height of the piston according to the invention and thus its weight increases or the remaining ring lands must be reduced in height.
  • a second measure comes a larger radius of fill in the transition between the flutes and the groove bottom into consideration, which in turn raises two problems in principle: First, the
  • lateral or axial forces can thereby occur in the region of the radii of curvature which do not cancel each other out and can cause lateral deflection of the cutting tool when the groove is cut.
  • the present invention therefore deals with the problem of providing a piston of the generic type an improved or at least one alternative embodiment, which is characterized in particular by a reduced notch effect in the region of a ring portion of the piston.
  • the present invention is based on the general idea, in a piston known per se for an internal combustion engine with a piston head and a piston skirt and a circumferential in the region of the piston head ring section, arranged in the region of the ring portion for receiving a piston ring annular groove in the region of at least one transition from one of the groove flanks in a groove bottom in such a way that it merges into the groove flank at a special bending angle, while the transition into the groove base via a preferably kink-free radius, that is, in particular tangential takes place.
  • the piston according to the invention has in the range at least one annular groove two groove flanks and the aforementioned groove base, wherein at least one transition at an angle ⁇ of 35 ° ⁇ ⁇ 50 ° merges into the associated lateral groove flank, while the transition has a radius r 2 and r 2 in this under the radius Groove bottom passes.
  • at least one inventively formed transition between a groove bottom and an associated groove flank in particular load peaks of the notch effect can be significantly reduced, for example, significantly reduce compared to a steady transition in the form of a quarter circle with corner radius n.
  • the radius r 2 is at most 1.6 times a corner radius n between the groove base and the associated groove flank, wherein the corner radius n is equal to the distance a of the midpoint M 2 of the radius r 2 from the associated groove flank.
  • the center Mi of the corner radius n is thus located on a straight line with the center M 2 of the radius r 2 , wherein the line between Mi and M 2 is a parallel to the groove flank.
  • transition with radius r 2 and the ratio of the radius r 2 to Eckradius n can be achieved with uniform smooth transition from the groove bottom to groove flank towards a lower notch effect, resulting in lower groove heights H or at the same groove height H a reduced notch effect of the groove bottom can be realized towards the groove side.
  • at least one transition or both transitions pass under a (bending) angle ⁇ of 42.5 ° ⁇ ⁇ 47.5 ° into the associated groove flank.
  • Such an angular range for the angle ⁇ provides an additional improvement of
  • Notch effect that is, an additional reduction of the notch effect, which in turn result in lower notch effects at the same groove height H or thereby a lower groove height H and thus a reduced piston height can be achieved, which is particularly modern
  • the ratio 1, 2 ri ⁇ r 2 ⁇ 1, 6 n applies to the corner radius n and the radius r 2.
  • the above-mentioned equation thus clearly shows that the radius r 2 is limited in terms of size At least 1, 2 times the corner radius n and at most to 1, 6 times the corner radius n.
  • the reduction of the groove height and connected to the reduction of the piston height allows a particularly compact design Internal combustion engine, which is particularly advantageous in modern motor vehicles with a small space available.
  • the radius r 2 is at most 1.6 times a corner radius n between the groove bottom and the associated groove flank, the corner radius n being equal to the distance a of the midpoint M 2 of the radius r 2 from the associated one Groove flank is.
  • the piston is made of a light metal alloy, in particular of a
  • Aluminum alloy or made of a steel alloy. With out of one Steel alloy produced pistons can be robust solutions for
  • aluminum alloy has improved thermal conductivity, which is particularly the cooling of the piston and thus also its
  • a further improvement in the performance of the piston according to the invention can be achieved in that a cooling channel is arranged in the region of the ring section. This can be closed or open
  • Cooling channel be formed and either contain, for example, a sodium-containing potassium cooling medium or cooled by a spray oil cooling.
  • the present invention is further based on the general idea to equip an internal combustion engine with at least one such piston, wherein the internal combustion engine according to the invention allows more compact piston due to the higher sustainable load peaks in the region of the annular grooves and thus a lower overall height of the internal combustion engine itself.
  • FIG. 1 is a sectional view through a possible embodiment of a piston according to the invention
  • Fig. 2 shows a detailed representation of the transitions between a groove base and the groove edges of an annular groove.
  • Ring part 4 has at least one annular groove 5 for receiving a piston ring 6.
  • the annular groove 5 has in a known manner two groove flanks 7 and 7 'and a groove bottom 8, which connects the two groove flanks 7 and 7' with each other.
  • At least one transition 9, 9 'or both transitions 9, 9' pass at an angle ⁇ of 35 ° ⁇ ⁇ 50 ° into the associated one
  • the corner radius n is equal to the distance a of a center M 2 of the radius r 2 from the associated groove flank 7, 7 '.
  • At least one of the two transitions 9, 9 ' is particularly preferred or both go at an angle ⁇ of 42.5 ° ⁇ ⁇ 47.5 ° into the
  • transition 9, 9 ' can in particular a significant reduction of load peaks of the notch effect compared to a steady transition in the form of a quarter circle (radius n) can be achieved, which can achieve a significant increase in the load capacity of the piston 1. If only the same load capacity is desired, a significantly reduced groove height H can be realized with the transitions 9, 9 'designed according to the invention, as a result of which the piston 1 can have a significantly lower height and thus also the internal combustion engine 10.
  • n and the radius r 2 is preferably the ratio 1, 2 n ⁇ r 2 ⁇ 1, 6 n, whereby a ratio can be determined, by means of which particular advantages with respect to the reduction of load peaks and the
  • the piston 1 is made of a light metal alloy, in particular of an aluminum alloy, or of a steel alloy. Especially the use of light metal alloys like
  • an aluminum alloy allows a larger
  • annular groove 5 is preferably arranged adjacent to a firing bar 1 1, wherein of course other annular grooves 5 can be formed like this.
  • a cooling channel 12 can be arranged in the region of the ring section 4, as a result of which the piston 1 can be cooled in an improved manner, and thus has an improved temperature load capability.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

La présente invention concerne un piston (1) pour un moteur à combustion interne (10), comprenant une tête de piston (2) et une tige de piston (3). La tête de piston (2) possède une partie annulaire (4) circonférentielle ainsi qu'au moins une rainure annulaire (5) dans la zone de la partie annulaire (4) servant à accueillir un segment de piston (6), laquelle comporte deux flancs de rainure (7, 7') et un fond de rainure (8) et chaque flanc de rainure (7 ,7') se fondant dans le fond de rainure (8) par le biais d'une transition (9, 9') associée. L'invention est caractérisée en ce qu'au moins une transition (9, 9') se fond dans le flanc de rainure (7, 7') associé sous un angle α tel que 35° < α < 50° ; en ce qu'au moins une transition (9, 9') présente un rayon r2 et se fond dans le fond de rainure (8) avec ce rayon r2, notamment de manière tangentielle.
PCT/EP2018/071929 2017-09-07 2018-08-13 Piston Ceased WO2019048190A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017215834.4 2017-09-07
DE102017215834.4A DE102017215834A1 (de) 2017-09-07 2017-09-07 Kolben

Publications (1)

Publication Number Publication Date
WO2019048190A1 true WO2019048190A1 (fr) 2019-03-14

Family

ID=63207757

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2018/071929 Ceased WO2019048190A1 (fr) 2017-09-07 2018-08-13 Piston

Country Status (2)

Country Link
DE (1) DE102017215834A1 (fr)
WO (1) WO2019048190A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021207405A1 (de) 2021-07-13 2023-01-19 Federal-Mogul Nürnberg GmbH Stahlkolben für einen Verbrennungsmotor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020200153A1 (de) * 2020-01-08 2021-07-08 Mahle International Gmbh Verfahren zur Bearbeitung einer Ringnut

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928491A1 (de) * 1989-08-29 1991-03-07 Mahle Gmbh Oelringnut eines tauchkolbens fuer verbrennungsmotoren
JP2009228685A (ja) * 2008-03-19 2009-10-08 Teikoku Piston Ring Co Ltd 板バネ付きピストンリング及びピストンとピストンリングの組合せ
DE102012204770A1 (de) * 2012-03-26 2013-09-26 Mahle International Gmbh Kolben

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007297975A (ja) * 2006-04-28 2007-11-15 Toyota Motor Corp 内燃機関のピストンユニット及びピストンのリング溝構造
US9334830B2 (en) * 2014-06-06 2016-05-10 General Electric Company Piston assembly for a reciprocating engine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3928491A1 (de) * 1989-08-29 1991-03-07 Mahle Gmbh Oelringnut eines tauchkolbens fuer verbrennungsmotoren
JP2009228685A (ja) * 2008-03-19 2009-10-08 Teikoku Piston Ring Co Ltd 板バネ付きピストンリング及びピストンとピストンリングの組合せ
DE102012204770A1 (de) * 2012-03-26 2013-09-26 Mahle International Gmbh Kolben

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021207405A1 (de) 2021-07-13 2023-01-19 Federal-Mogul Nürnberg GmbH Stahlkolben für einen Verbrennungsmotor

Also Published As

Publication number Publication date
DE102017215834A1 (de) 2019-03-07

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